The second crash, which was unrelated to the first, also happened on westbound 836 between 37th Avenue and LeJune Road and involved four vehicles, Miami Fire Rescue spokesman Lt. Ignatius Carroll said.

As one of the drivers got out of his car, he was struck by a vehicle that kept going and fled the scene, Carroll said.

The unidentified man suffered severe injury to his arm and was taken to Ryder Trauma Center, Carroll said.

A third crash was also reported in the same area of the second.

The crashes had all westbound lanes of 836 closed as authorities investigated. Drivers were encouraged to seek alternate routes.

Traffic was expected to be tied up in the area beyond rush hour, Sanchez said.